P0544
LowP0544 — Exhaust Gas Temperature Sensor Circuit Malfunction
Description
What P0544 Means
Code P0544 points to a fault in the exhaust gas temperature (EGT) sensor circuit. The sensor isn't sending a correct signal to the engine control unit (DME), which can be caused by a failed sensor, wiring problems, or exposure to extreme temperatures.
The exhaust gas temperature monitoring system matters for mixture control, exhaust gas recirculation (EGR) operation, and protecting exhaust components from overheating. When the sensor fails, the DME may enter limp mode, limiting power and hurting fuel economy.
Symptoms
Symptoms
- Fuel economy drops.
- Emissions creep up.
- Check Engine light on the instrument cluster.
Causes and fixes
Diagnosis and Repair
- Check sensor resistance: Measure the exhaust gas temperature sensor resistance with a multimeter and compare it to the factory specs.
- Inspect the wiring: Check the wires and connectors for continuity and look for corrosion or damage.
- Replace the sensor: If the sensor is faulty, replace it with a new one.